<body>
  <table>
    <tr><th>姓名</th><th>语文</th><th>数学</th></tr>
    <tr><td>Tom</td><td>76</td><td>89</td></tr> 
    <tr><td>Lucy</td><td>98</td><td>90</td></tr>
    <tr><td>Jimmy</td><td>100</td><td>99</td></tr>
    <tr><td>John</td><td>45</td><td>12</td></tr>
  </table>
  <script src="jquery-1.12.4.min.js"></script>
  <script>
    console.log($('tr:first'));
    console.log($('tr:odd'));
    console.log($('tr:not(tr:first)'));
  </script>
  <p>
    <a href="file:///C:/Users/rise/Desktop/%E9%A6%96%E9%A1%B5/default/11.html">返回</a>
</p>
</body>